| 1 | DAI | Denair Aviation Limited | Callsign: Denair, | GB | AVCODES |
| 2 | DAI | Dena Airways | IATA: D9, Callsign: Dena, IATA Prefix: 313, | IR | AVCODES |
| 3 | DAIA | DESERT AIR ALASKA | | | SCAC4 |
| 4 | DAIB | DSJ ACQUISITIONS INC | | | SCAC4 |
| 5 | DAIC | DAILY EXPRESS, INC. | | | SCAC1 |
| 6 | DAIC | DAILY EXPRESS, INC | | | SCAC4 |
| 7 | DAIH | Daihatsu | | ROK | TRAFFIC |
| 8 | DAIM | DAIM LOGISTICS INC | | | SCAC4 |
| 9 | DAIN | DAIN INDUSTRIES | | | SCAC4 |
| 10 | DAIO | DAL SOGLIO INC | | | SCAC4 |
| 11 | DAIP | DIRECT AIR INC | | | SCAC4 |
| 12 | DAIQ | DSJ ACQUISITIONS INC | | | SCAC4 |
| 13 | DAIR | D&I R.R. Co. | added 7/1982; 1/1994-7/2005 | | NAKINA |
| 14 | DAIR | D&I R.R. Co. | added 7/82; 1/94-7/2000 | | NRHS |
| 15 | DAIR | D & I RAILROAD CO. | | | PWRC |
| 16 | DAIR | D&I Railroad | | | RSRV |
| 17 | DAIR | Dakota & Iowa Railroad Co. | | USA | TRAFFIC |
| 18 | DAIS | DISTRIBUTION AIR & TRANSPORTATION S | | | SCAC4 |
| 19 | DAIU | DAIKIN INDUSTRIES, LTD | | J | BIC |
| 20 | DAIU | DAIKIN INDUSTRIES LTD | | | SCAC4 |
| 21 | DAIX | Mt. Vernon Car Manufacturing Co. | 7/1935-7/1937; 4/1938-4/1961 (not listed) | | NAKINA |
| 22 | DAIX | Mt. Vernon Car Manufacturing Co. | 1/52-4/61 | | NRHS |
| 23 | DAIX | MT. VERNON CAR MANUFACTURING CO. | | | PWRC |
| 24 | DAIY | DAIRY TECH SALES | | | SCAC4 |
